Sullivan County's 2026 population is estimated at 5,568, reflecting a -1.61% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Sullivan County is the 106th largest county in Missouri. The 2010 population was 6,737 and has grown -17.35% since 2010.
Data after 2023 is projected based on recent change
Overall: 44.1 years
Female: 45 years
Male: 41.2 years
There are 4,548 adults, (1,218 of whom are seniors) in Sullivan County.
Female: 2,916 (49.8%)
Male: 2,941 (50.2%)
The racial composition of Sullivan County includes 80.09% White, 6.66% other race, and smaller percentages for Black or African American, Asian, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 4,691 | 80.09% |
| Two or more races | 535 | 9.13% |
| Other race | 390 | 6.66% |
| Black or African American | 157 | 2.68% |
| Asian | 60 | 1.02% |
| Native American | 24 | 0.41% |
Sullivan County 's average per capita income is $41,036. Household income levels show a median of $56,964. The poverty rate stands at 13.67%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $88,045 | - |
| Families | $72,857 | $91,910 |
| Households | $56,964 | $71,803 |
| Non Families | $35,161 | $38,798 |
Average Income
Median Household Income
Poverty Rate
